I'm not totally sure if this is a Meraki issue, however I thought I would see if anyone else has experienced this issue.
We have one site with a VPN connection to the Azure platform. We have installed an Active Directory server in the Azure environment and we have promoted it to a secondary domain controller.
The promotion worked fine and I've been able to setup fileshares and transfer at least 300GB to the server. However, the AD server is no longer able to contact the other domain controllers, although I am able to PING and RDP to the server through the VPN.